Question

The area of four walls of a room is 180 m^2. If the sum of its length and breadth is 10 m, find the height.​

Answer 1

Step-by-step explanation:

Answer

Let Length=l,breath=b,height=h

Area of four walls = 2h(l+b) = 108m

2

h:l=2:5,h:b=4:5 (Given)

∴h:l:b=4:10:5

Let h=4x,l=10x,b=5x

Now, the area of four walls, 2×4x(15x)=108

x

2

=

120

108

Then the area of the floor is l×b=10x×5x=50x

2

=50×

120

108

=45m

2

Answer 2

Answer:

ANSWER

It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.

Area of four walls of the room is: 2h(l+b)

A=2h(l+b)=2×3(8+5)=6×13=78 m

2

Area of the ceiling is:

A=l×b=8×5=40 m

2

Total area of the four walls and the ceiling of the room is 78+40=118 m

2

It is given that cost of white washing is Rs.15/m

2

, therefore,

Total cost of white washing is:

118×15=1770

Hence, the cost of white washing the walls is Rs.1770.